Henry m



H. M. CSOWTHER.

VALVE GRINDER APPLICATION FILED FEB. 8,1919.

Putente #:spt. 2, 1918.

1N VENTQP HENRY M. eCfiQM/THEI? HENRY M. cnow'rrma. orv KINGMAN, Anrzorm.

VALVE-GRIN ER.

Specification of Letters Patent.

Patented- Sept. 2. 1919.

Application filed February 8,1919. Serial No. 275,895.

To all whom it may concern Be it known that I, HENRY M. CRowTHER,

a citizen of the United States, residing at Kingman, in the county. of Mohave and State of Arizona, have invented new and useful Improvements in Valve-Grinders, of which the following is a specification.

This invention relates to automatic valve grinders and-consists of thenovel features herein shown, described and claimed.

My object is to provide simple means whereby thelinlet and exhaust valves of an internal combustion engine may be automatically rotated step by step b the reciprocation of the valve stems, an to providemeans whereby the grinding action may be discontinued at will,

A further and more specific object of my invention is to mount an automatic valve grinder upon aninternal combustion engine so as to rotate the inlet and exhaust valves step'by step by the reciprocation of the valve stems and to make irregular.

Another object of my invention is to make an automatic valve grinder which will slightly rotate the valves both on the seat and off the seat so that the grinding action may be continued indefinitely without overgrinding.

Figure 1 is a fragmentary sectional elevation showing an automatic valve grinder embodying the principles of my invention in position for use.

Fig. 2 is a fragmentary sectional detail at right angles to Fig. 1 and taken on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal sectional detail on the line 33 of Fig. 1 and looking downwardly.

Inlet and exhaust valves 1 and 2 have stems 3 and 4 extending downwardly. through a casing 5 and operated by cams 6 and 7 upon a cam shaft 8. A rectangular opening 9 is formed through the stem 3 and a double headed key 10 is inserted through this opening and the central portion of the key is reduced so that when the key settles down the heads are upon oppositesides of the stem so as to hold the key in place A the step by step motion hub 11 fits loosely upon the stem 3 and has a recess 1n its lower end to receive the heads I of the key 10 so that when-thehubisettles down upon the key the hub is held from ro-- tating on the stem. A spring seat 12 extends "outwardly from the lower end ofthe hub 11. A ball bearing 13 is mou'ntedin the spring seat 12 and a spring 14: is placed'upon the stem 3 with its upper end hearingagainst a' spring seat 15 upon the casing 5 and its lowerend resting upon the ball bearmg 13 in the spring seat 12,- the tension'of the spring 14 being exerted to hold the valve 1 closed. The cam 6' serves'to open the valve 1.

An annular rim 16 extends upwardly from the outer edge of the spring seat 12 concentric to the hub 11, and ratchet teeth 17 are formed in theupper edge of this mm.

In a like manner a key 18 is mounted and the tension or the spring serves to hold the valve 2 upon its seat.

A bearing plate 25 fits against a vertical wall 26 of the water jacket and is held in. place by cap screws 27. The bearing plate 25 is located in a plane half waj'between the f springs 14 and 21 and somewhat above the lower ends of the springs. A horizontal bearing 28 extends outwardly from the hearing plate 25. A shaft 29 is rotatably mounted in the bearing 28 and the ends of the shaft are turned down to form eccentric pawl pivots 30. 'Pawls 31 and 32 are loosely mounted upon the eccentric pawl pivots 80, the free ends of the pawls 31 and 32 being in position to engage the ratchet teeth 17 and 23. Leaf springs 33 and 34 are rigidly secured to the bearing 28 by screws 35 and the free ends of the springs an age the pawls 31 and 32 to press the paw s downwardly into engagement with the ratchet teeth 17 and 23. Secondary ratchet wheels pivots outside of the headsof the pawls 31 and 32. Secondary pawls 37 and 38 are pivotally mounted upon the pawls 31 and 32-150 engage the secondary pawl wheels 35 and 36, and secondary springs 39 and -10 are fixed to the pawls 31 and 32 to engage the secondary pawls 37 and 38 to hold the Secondary pawls in engagement w1th the secondary ratchet wheels 35 and 36 so that as the free ends of, the pawls 31 and 32 swing up and down the eccentric pivots 30 will be rotated to move the pawls 31 and 32 longitudinally back and forth.

A cord 41 has branches 42 and 43 connected to the free ends of the pawls 31 and 32 and'the cord 41 extends through a housing Hand is "attached to a handle ring sald cord 41 being long enough to allow the;

, pawls 3l and 32 to vibrate freely when it "is desired to work the valve grinder. knot 16 is formed in the cord 41 and an opening 17 is formed through the housing 44 large enough to, allow the knot 16 to pass and a slot 48 extends downwardly from theopening 47 so that when the handle ring 45 is manually operated to pull the cord 41 {the knot4=6 will pass through the opening 47 and then when the handle ring 45 is released the cord 41 will pass downwardly into the slot, 48 with the knot 46 on the out- 1 side of the housing 44, thereby holding the pawls 31and 32 elevated out of engagement withthe main pawl wheels, formed by the annular rims .16 and 22 carrying the ratchet teeth 17 and 23 so as to render the valve grinder inoperative. c

When the handle ring 45 is operated to pass the cord 41 through the opening 47 and released, the pawls 31 and 32 will press downwardly upon the main pawl wheels and .then when the engine is operated and the cam shaft 8 rotated the stems 3 and 4 will be rotated step by step to rotate the valves 1 and 2, and the step by step motion Wlll be varied by the eccentric motion of the pivots 30. The rotation. of the valves 1 and 2 is caused by the up motion of the main pawl wheels and is due to the swing of the free ends of the pawls 31 and 32 in arcs relative tothe pivots 30 and the advancement of a valve at each operation will be very slight and will be more or less according to the by reciprocation of the other valve.

pawl 32, for instance, goes up as in Fig. 1, the eccentric shaft 30 is rotated to reciprocate the pawl 31 back and forth and when the eccentric is on the down stroke and moved forwardly the pawl 31 is pushed be very slight so that the grinding action may be continued indefinitely without overgrinding.

Various changes may be made without departing from the spirit of my invention as claimed.

I claim: p 1. In a valve grinder the combination with a valve having a reciprocating stem of a pawl wheel non-rotatably mounted upon the stem and having teeth extending in a plane parallel with the stem; a bearing plate attached to the wall of the engine substantially on a level with the pawl wheels; a

pawl ivotally connected to'the bearing and engaging the pawl wheel so as to rotate the pawl wheel step by step as the stem reciprocates; and means for moving the pawl longitudinally back and forth by the vibration of the pawl.

2. In a valve grinder the combination with a valve having a reciprocating stem of a pawl wheel non-rotatably mounted upon the stem and having teeth in a plane concentric to and parallel with the stem; a bearing plate fixed to the water jacket wall; a bearing extending outwardly from the bearing plate; a shaft rotatably mounted in the bearing; an eccentric pivot upon the shaft; a. pawl loosely mounted upon the pivot and engaging the pawl wheel upon the valve stem; a secondary pawl wheel fixed upon the shaft; and a secondary pawl connected to the first pawl and engaging the secondary pawl wheel so that the valve will be rotated step by step as the stem reciprocates and so that the eccentric pivot will be rotated as the main pawl vibrates.

3. In a valve grinder the combination with two valves having alternately reciprocating stems, of pawl wheels fixed upon the stems; pawls mounted upon an eccentric shaft and engaging the pawl wheels; and

means whereby the swinging movement of the pawls operates the eccentric so that the reciprocation of one valve stem will rotate the other valve upon its seat.

4:. In a valve grinder the combination with two valves having alternately reciproeating stems, of pawl Wheels fixed upon the rotate the eccentric shaft by the vibration stems; an eccentric (shaft; pewls loosely of the pewls so that the reciprocation of one mounted upon the eccentric shaft and envalve will rotate the other valve upon its 10 gaging the pawl Wheels; secondary pawl seat. Wheels fixed upon. the eccentric shaft; and In testimony whereof I have signed my secondary pawls carried by the first pawls to name to this specification.

engage the secondary pawl Wheels so as to HENRY M, CRGWTHER. 

